<template>
  <div>
    <div class="todo-container">
      <div class="todo-wrap">
        <Header :addobj="addobj"/>
        <List 
        :lists="lists"
        v-if="lists.length"
        />
        <Footer 
        :lists="lists"
        :checkallobj="checkallobj"
        :delallobj="delallobj"
        v-if="lists.length"/>
      </div>
    </div>
  </div>
</template>

<script>
import Footer from "./components/Footer.vue";
import Header from "./components/Header.vue";
import List from "./components/List.vue";
export default {
  name: "App",
  components: {
    Footer,
    Header,
    List,
  },
  data(){
    return{
      //由于todos是MyHeader组件和MyFooter组件都在使用，所以放在App中（状态提升）
				lists:JSON.parse(localStorage.getItem("lists")) || []
    }
  },
  methods: {
    addobj(obj){
      this.lists.unshift(obj)
    },
    checkobj(id){
      this.lists.map((obj)=>{
        if(obj.id===id) obj.done=!obj.done
      })
    },
    delobj(id){
      this.lists=this.lists.filter((obj)=> obj.id!==id)
    },
    checkallobj(done){
      this.lists.map((obj)=>{
          obj.done=done
      })
    },
    delallobj(){
      this.lists=this.lists.filter((obj)=> !obj.done)
    }
  },
  watch: {
    lists(val){
        localStorage.setItem("lists",JSON.stringify(val))
    }
  },
  mounted() {
    this.$bus.$on("checkobj",this.checkobj)
    this.$bus.$on("delobj",this.delobj)
  },
  beforeDestroy () {
    this.$off("checkallobj")
    this.$off("delallobj")
  }
};
</script>

<style>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}

</style>